Control apparatus



T. S. PUKERUD.

CONTROL APPARATUS. APPLICATION FILED JUNE 6.1916.

Patented May 11, 1920.

Fig. 2.

INVENTOR Thomas S. Pukerud UNTTE STAE 6:115

THOMAS S. PUKERUD, 01E WILKINSBURG, PENNS'FZ'LVANIA, ASSIGNDR TOW'ES'TING- HOUSE ELECTRIC AND MANUFACTURING" GOMPANY, A CGRPORATION OFPENN- SYLVANIA.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed June 6, 1816. Serial 110. 101,966.

To all whom it may concern:

Be it known that I, THOMAS S. PUKERUD, a citizen of the United States,and a resident of Wilkinsburg, in the county of Allegheny and StateofPennsylvania, have invented a new and useful Improvement in ControlApparatus, of which the following is a specification.

My invention relates to controllers for governing the operation ofelectric motors and particularly to that type of controller having amain and a reverser drum.

The object of my invention is to provide a particularly simple anddurable mechanical device for controllers of the above-indicated classthat shall .effectively accentuate the various positions of the maincontroller drum and also prevent movement of the auxiliary drum when themain drum is in other than the off position, and shall prevent movementof the main drum when the auxiliary drum is in other than an operativeposition.

Heretofore, controllers of the above-mentioned type have been providedwith a member to accentuate the various positions of the main controllerdrum and an additional member to interlock the drums, one with theother, in the manner above set forth.

My invention provides a single-piece pawl that effectively interlocksthe two control drums and also accentuates the various positions of themain controller drum.

Figure 1 and Fig. 2 of the accompanying drawing are, respectively, a topplan view and a side view, partially in section and partially inelevation, of a controller embodying my invention.

The controller shown in the drawing comprises a casing 1, a plurality ofrotatably mounted drums 2 and 8, a notched star wheel 4, a notched cam 5and an improved pawl 6.

The drum 2 is rigidly mounted upon a shaft 8 which is shown as partiallybroken away to more clearly illustrate the invention. The star wheel 4:is rigidly secured to the shaft 8 and is provided with a plurality ofnotches 9, of substantially equal depth, that corresponds to the variousoperating positions of the controller drum 2 and a notch 10 of greaterdepth that corresponds to the off position of the controller drum. Theauxiliarydrum 3 is adapted to change the motor connections from thosefor forward direction of operation to reverse direc tion of operationand is rigidly secured to a rotatably mounted shaft 11 to which the cam5 is also attached. The notch 12 of the cam 5, which corresponds to theneutral position of the reverser drum 8, is of less depth than theadjacent notches 13 which correspond to the forward and reversepositions of the drum 3. The pawl 6 is provided with an off-set lug 1 1that is adapted to engage'the notched portions of the star wheel 1 andthereby accentuate the positions of the main controller drum 2, a lug 15which is adapted to engage the notched por tions of the cam 5 andthereby interlock the auxiliary drum with the main drum, as hereinbeforedescribed, and a transverse slot 16 that is positioned intermediate thelugs 14 and 15. The lug 1 1 is preferably provided with a roller 17. Apin 18 is secured to the casing 1 and is adapted to engage the slot 16and to thereby prevent lon' gitudinal movement and to restrict lateralmovement of the pawl 6 in one direction. One end of a spring 19 issecured to the casing 1 by a pin 20 and the other end thereof isattached to the pawl 6 and'biases the same to engagement with thenotches of the star wheel 4 and the cam 5.

With the controller drums occupying the relative positions shown in thedrawing, an attempt to move the main drum 2 will cause the lug 14 torise on the adjacent star-wheel tooth until the pin 18 engages thebottom of the slot 16 which, by reason of the shallow slot 12, stopsfurther movement of the lug 14 and thereby prevents the rotation of thedrum 2. If, however, the drum 3 he moved to either a forward or areverse position, the deeper notches 13 will permit of the rise of thelug 1% over the adjacent tooth of the star wheel and thereby allow ofthe rotation of the drum 2. The spring 19 biases the lug 141 intoengagement with each notch 9 and thus effectively accentuates thevarious positions of the controller drum. The relative shallowness ofthe notches 9 will not permit of the movement of the cam 5 when the lug19 is in engagement with other than the notch 10.

From the above description, it will be readily understood that myproposed pawl member will perform the function of effectivelyaccentuating the various controller positions and will also definitely.interlock.

the auxiliary and the main drums simultaneous rotation.

I claim as my invention:

1. In a controller, the combination with a plurality of rotatablymounted contact-bearing drums, a star wheel rigidly secured to one ofsaid drums, and a notched cam secured to another of said drums, oi asingle pawl having an intermediate pivo point and having its respectiveends engaging said star wheel and said cam to prevent the simultaneousrotation 01": said drums and to accentuate the positions of said drums,and a spring having its respective ends attached to said pawl near saidpivotal point and to a stationary part of said controller for biasingthe pawl to its engaging position.

2. In a controller, the combination with a plurality of rotatable drums,a notched cam rigidly secured to one of said drums, and a star wheelrigidly secured to another oi? said drums, of a loo ely piwytallymounted position-accentuatingz; one piece pawl having its respectiveends engagingsaid notched cam and said star wheel, and a spring forbiasing said pawl to engagement with said wheel and cam.

3. In a controller, the combination with a main drum having a star wieel the not-flies of which correspond to the positions oi thecontroller, and an auxiliary drum having; a notched cam, of afunctionally integral pawl pivotally mounted at a single point andhaving one end engaging the notches of said star wheel to therebyaccentuate the positions of said main drum and the other end engagingsaid cam, and a tensile spring acting upon the pawl near said point.

4-. In a controller, the combination with a plurality of notchedrotatable members, oil a single loosely intermediately mounted. pawlengaging said members t accentuate the positions thereof and tointerlock the said members against simultaneous movement, and a springacting directly upon the mountingpoint.

In a controller, the combination with a plurality of notched rotatablemembers, oi a position-accentuating pawl having a slot intermediate itsends, a pin extending: through said slot for positioning said pawl and aspring for biasing said pawl to engagement with said rotatable m mbers.

6. In a controller, the combination w a plurality of notched rotatablemend of a pawl tangentially disposed relative to said rotatable membersand mounted to have restricted longitudinal movement and lateralmovement restricted in one direction, and resilient means for biasinrrsaid pawl into engagement with said rotatable members.

7. In a controller, the combination with a plurality of notchedrotatable memb" of single pawl tangentially disposed w .l respect toeach of said members, and a tensile spring attached to a central pointof the pawl for resiliently biasing; said pawl to engagement with saidnotched members.

8. In a controller, the combination with a plurality of notchedrotatable members, of a pawl tangentially disposed with respect to eachof said members and having a lateral slot and a plurality of projectionsfor en- ;g aging the notches of said rotatable members to therebyaccentuate the positions of said mernbers, a pin extend through saidslot to pivotally and slidably mount said pawl, and resilient means forbiasing said i iember to its operative position.

9. In a controller, the combination with a plurality of notchedrotatable members, of a position-ac-rentuatingr pawl tangentially speedwith respect to each of said members, 'tudin ,l movement of said pawland tor restrf 'l means for pre=-renl1in, ,1' long lateral movementtnereot in one dire and resilient means acting upon the pawl near said.first means for biasing); said pawl into engagement 'ith said rotatablemembers.

10. In a controller, the combination with a main drum having astar-wheel secured thereto, and an auxiliary drum having a notched cam,of single integral positionaccentuating pawl adapted to engage saidstar-wheel and said. cam and to lock the auxiliary drum in positionexcept when the main drum is in its off position and' a tensile springacting upon a central point of said. pawl to effect yielding: engagementthereof with said star-wheel and said cam.

11. In a controller, the combination with a drum, a notched wheelsecured to said drum and having; a notch of greater depth than theadjacent notches, an auxiliary drum, and a notched cam secured to saidauxiliary drum and having; a notch (Pl less depth than the adjacentnotches, ot a singlepiece position-accentuating pawl adapted toliechanically interlock said auxiliary drum in position for cert" inpositions ot' said main drum and for loc d main drum in ing sci positionfor a certain position o'l said auxiliary drum.

In controller, the combination with a main drum havinp a star wheel. andan an: liary drum having" a notched cam, of a sin le-picceposition-accentusting pawl onv end of? whl =h has an offset lug: adaptedto on; e said star wheel, the other end of which has an oll'sct lugadapted to engage said cam and a lateral]y-disposed .lot intermediatesaid lues pin adapted to engage said slot and position said member, andmeans for biasing said lugs into engagement with said wheel and saidcam.

In testimony whereof, have hereunto subscribed my ame this 31st day ofMay THOS. S. PUKERUD.

